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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता ११ वी

Choose the correct alternative. Which of the following is an ohmic conductor? - Physics

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प्रश्न

Choose the correct alternative.

Which of the following is an ohmic conductor?

पर्याय

  • transistor

  • vacuum tube

  • electrolyte

  • nichrome wire

MCQ

उत्तर

nichrome wire

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 11: Electric Current Through Conductors - Exercises [पृष्ठ २१९]

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बालभारती Physics [English] 11 Standard Maharashtra State Board
पाठ 11 Electric Current Through Conductors
Exercises | Q 1. (ii) | पृष्ठ २१९

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.

  1. 0.2 A
  2. 0.5 A
  3. 2 A
  4. 5 A

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?


When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.


What is an Ohmic resistor?


The resistors R1, R2, R3 and R4 in the figure given below are all equal in value. 

 

What would you expect the voltmeter A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?


How does an increase in the temperature affect the specific resistance of a : 
(i) Metal and
(ii) Semiconductor ?


A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is  earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the  nature of charge on the sphere? Give reason for your answer. 


Consider the sacle of voltmeter shown in the diagram and answer the following questions : 

(a) What is the least count of the voltmeter?

(b) What is the reading shown by the voltmeter ?

(c) If the voltmeter is connected across a resistor of 20 `Omega` how much current is flowing through the resistor?


Define one ohm.

Fig. represents the circuit used for the verification of ohm's law. Label the different parts from A and F. State the function of each.


State Ohm's law. What are its limitations?

Fig.  represents the circuit used for the verification of Ohm's law. Label the parts from A to F. state the function of each.


  1. Name and state the law which relates the potential difference and current in a conductor.
  2. What is the necessary condition for a conductor to obey the law named above in part (a) ?

The filament of a bulb takes a current 100 mA when potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 400 mA. Calculate the resistance of filament in each case and account for the difference.


State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this. relationship.


What is non-ohmic resistor?


Answer the following question.

Distinguish between Ohmic and non-ohmic substances; explain with the help of example.


SI unit of resistance is:


What is ohmic device?


Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.


Explain the equivalent resistance of a parallel resistor network.


The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.


The variable resistance is called ____________.


A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true? 


Two cells of same emf E but internal resistance r1 and r2 are connected in series to an external resistor R (Figure). What should be the value of R so that the potential difference across the terminals of the first cell becomes zero.


Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter 2 mm and inner diameter 1 mm. Find the ratio of resistance RA to RB.


What is meant by resistance of a conductor ? Define its SI unit.


The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become ______.


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